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我理解错了，F应该恒定1，我们的目的是测出一次弹射中有多少能量被自遮蔽，所以不应该考虑透射，即菲涅尔项永远为1。

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别纠结sintheta，costheta，他就是把反射率方程的Li换成1然后做换元，我们还是对反射率方程做蒙特卡洛积分。可以看下面的推导

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https://blog.csdn.net/i_dovelemon/article/details/79598921?spm=1001.2014.3001.5502
可以参考一下这篇文章

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